Injection mold is a kind of tool for producing plastic […]
Injection mold is a kind of tool for producing plastic products. In order to meet the needs of molded parts, we need to pay attention to some matters when selecting injection molds, and put forward corresponding requirements. The following tells you to choose the more suitable injection mold to meet the six major requirements.
1. High corrosion resistance Many resins and additives have a corrosive effect on the surface of the cavity. This corrosion causes the surface of the cavity to erode and flaking away. The surface condition deteriorates and the quality of the plastic parts deteriorates.Injection mould Therefore, it is best to use corrosion-resistant steel, or chrome plated, niobium nickel processing on the cavity surface.
2. Good abrasion resistance The glossiness and precision of the surface of injection molded plastic parts are directly related to the wear resistance of the surface of the injection mold cavity. Especially when some plastics are added with glass fiber, inorganic fillers and some pigments, they are Together with the plastic melt in the flow path, the mold cavity idling flow, the friction on the surface of the cavity is very large, if the material is not wear-resistant, it will soon wear out, so that the quality of plastic parts is damaged.
3, good dimensional stability In the injection molding, the temperature of the injection mold cavity should reach 300 °C or more. For this reason, it is best to use an appropriately tempered tool steel (heat-treated steel). Failure to do so can cause changes in the microstructure of the material, which can cause changes in the dimensions of the injection mold.
4, easy to process Mold parts are mostly made of metal materials, some of the structure is still very complex, in order to shorten the production cycle and improve efficiency, require mold materials easily processed into the shape and precision required by the drawings.
5. Good Polishing Performance Injection molded plastic parts usually require good gloss and surface conditions. Therefore, the roughness of the surface of the cavity is required to be very small. In this way, the surface of the cavity must be subjected to surface processing such as polishing and grinding. Therefore, the selected steel should not contain rough impurities and pores.
6, affected by the heat treatment in order to mention the hardness and wear resistance, generally on the injection mold to be heat treatment, but this treatment should make its size change is very small. Therefore, it is best to use pre-hardened steel that can be machined.